Issue 5/2003

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The contribution draws the attention to the present-day problems of the large-scale subterranean parking places, when the data for the ventilation dimensioning indicated in the standard ČSN 73 6058 does not correspond with the present-day technical condition of the vehicles. The methodology of the ventilation calculation indicated in the above mentioned ČSN standard is considerably simplified and its application leads to uneconomical ventilation overdimensioning. The contribution points out that there exist a possibility to carry out a more precise calculation of the air flow for the parking place ventilation and a general calculation procedure is indicated.

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Personalized ventilation provides clean air at each workplace. The aim is to improve substantially the quality of air inhaled by each occupant and to ensure thermal comfort. Each occupant is provided with the possibility to generate and control his/her microclimate. This article summarizes and discusses the principles involved and outlines recent results on the performance of personalized ventilation.

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This article describes the development of indirect dew point cooling in the Netherlands. So called „Desert Cooling“ exists decades but is only widely used in dry climates. Coolers based on evaporating water, suitable for temperate climates like in the Netherlands, were in the past expensive and complex. Recent developments open the possibilities for a widely spread use in temperate climates and is now regarded as one of the most promising developments for „coled ventilation“ in temperate climates.

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In two tables the extreme temperature characteristics of outdoor air in Prague are indicated for the individual years from 1990 up to 2002. Another three tables pay attention also to other towns in the Czech Republic and bring the long-term averages of extreme temperature parameters in the course of the period 1961–1990. The accompanying text explains the used terminology.

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The article deals with the influence of the bathroom radiators enclosures by the dry and wet textiles on their heat output. It presents the experimentally found values of heat output changes and it renders so to the designers the guideline for the design of these heating surfaces.

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The author draws the attention to the not very solved problems of the fire-fighting wall-bushings of the distribution piping systems in the designing practice. At the same time he refers to the consequences that become evident in the course of the constructions finishing. The suppliers of the relevant technologic systems bear the main responsibility for the correctly carried out fire-fighting wall-bushings, in case of more favourable contractual relation the supplier of the constructional part bears the responsibility. The optimum solution is to ensure for this work a specialised firm that will shoulder the full guarantees. In case that the provisions of the fire safety standards and regulations are not observed the danger threatens that the investor does not take over the finished construction and in that case with all mainly financial recourses of the suppliers.

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The authors summed up the requirements concerning the clean spaces in the health service. They put forward the information about valid legislation, verification of required micro-climatic parameters in practice and mentioned the most frequent faults met in the course of measuring.

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In current article is discussed a possibility of utilization of reversible thermochemical reaction behalf thermal energy accumulation. Adsorption processes bring out in principal advisability for heat storage. Characteristics of some adsorption materials make possible storage along with high density and all at once conserve thermal energy for a long time less bold heat loss. In the article is described principle basal adsorption march, characteristics used sorption materials together with their basal characterization. Purposes experiment is bring out scope system control, that is close incorporate with enquiry dynamics of sorption process and alongside of that ascertain relation between heat, which is lost in backward reaction, and heat required at activation charge, and subsequently now quantify both energy and economic requirements of the framework.